Authority letter : অধিকার-পত্র;
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Appropriate Prepositions
Appropriate to(যোগ্য): His answer is appropriate to the question.
Averse to (বিমুখ): Rahim was averse of your various problems.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Set something right (ঠিক করা)— He will set the machine right.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.